As a frugal shopper I'm always looking for the next website that gives the lowest prices.
For the last while, RIBBLE was leading the pack in terms of cheapest online prices. Since their acquisition by an investment firm, their prices went up.
I've found a website with pretty competitive prices:
https://www.raceviewcycles.com
Even with the shipping fee ($18CAD), depending on what you're buying, this website is still much cheaper than any other competitor website.
Shipping is by Parcel Force 3-5 days to canada, and fee was $18CAD for 2 tires and a bottle of chain lube.
I just bought a pair of the new Vittoria Corsa G+ graphene tires, pretty excited to try them out.
$79.49 per tire on Probikekit
$54.93 per tire on raceviewcycles